Principles Of American Forestry

Synopsis

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...yielding 1,450 board measure. The largest recorded acre yield of White Pine in Minnesota was near Carlton. The full yield of this acre was 111,050 feet board measure, and after deducting for rot and crooks 94,264 feet of sound timber remained. The average yield of White Pine is much below this and large areas have been cut that did not yield over 5,000 feet board measure per acre. Marketable White and Norway Pine may be grown in about thirty years under the best conditions, and at this age will probably be about eight inches in diameter and forty feet high. But such trees are then growing very fast, and as the approximate increase in volume of the tree is as the square of the proportionate increase in diameter and the waste in working greatly decreases with the size of the trees, the cutting of them at such an early age would be at a loss of future profits. Such trees have very little, if any, heart wood, and yet this kind of timber is being grown and marketed in many of the Eastern States. In fact, there is very little heart to any of the pine now cut in the New England States, as it is practically all young second growth, and is generally marketed about as soon as it attains sufficient size to be salable, without regard to the fact that it is then making its most rapid growth. From careful observation, the Experiment Station of the University of Minnesota estimates that on land adapted to the White Pine, with a thick growth of this kind of trees eight inches in diameter, the annual increase should be about fifty cubic feet, or 500 feet board measure, per acre. In some cases this rate of increase has been more than doubled, but under ordinary good conditions not over one-third as much increase need be expected. The Thickness of the Annual Rings on trees va...